Sidewalk Cement
Slabs


Make your own concrete
slabs instructions.




Hand Mixed
Concrete Slabs



Design, Build Sidewalk
Slabs Yourself.

Sidewalk plywood forms,
two forms side-by-side



Making Concrete
Slabs Instructions



Build a form that you
can use more than one
time.

Decide on the size you
wish to make your slabs.

The ones shown here are 16
inches by 17 inches to meet
this particular need for a
concrete floor in a wood
shed.

The 4x8 sheet of plywood
was divided up into two
equal sides which fitted
five slabs on each half
of the plywood.

2 inch by 2-inch struts
were used to make form
dividers, actually 2x4,
cut down the center.

Nail or screw the outer
2x2 perimeter to the
3/4 inch thick plywood.

Make the cross interior
struts removable by
securing them from the
outer 2 x 2 perimeter
with screws;drill pilot
holes.

Removable slats make
it easy to remove the
slabs when they have
cured.

They will easily fall out
of the form when the
dividers are removed.

Tip



When you have completed
making the forms, paint
the form parts, this helps
prevent the cement from
sticking.

Take a black felt pen and
number each slat and form,
so the same slat will go
back in the same place,
and the retaining screw
hole in the perimeter 2 by
2, will line up perfectly
with the cross slat.


Mixing concrete by hand,
in a wheel barrel.


Oil the complete inside of
the form with any kind of
oil, such as used engine
oil.

This also helps prevent
the concrete from sticking
to the form.

Make crosses from rebar
and wire together in the
center.

Wire cable was used in
these forms.
An angle grinder was
used to cut the cable
to length.

Place one cross in each
square.

Working with a full sized
wheelbarrow, shovel 15
shovelfuls of sand/gravel
into the wheelbarrow.

Add 5 shovelfuls of
Portland all-purpose
cement.

Use a garden hoe and mix
the two dry ingredients.

Add a bucket full of water
and continue mixing,
adding more water as
needed.

The correct mixture is one
part of cement to three
parts of sand/gravel.

If you use gravel in your
concrete slabs, the mixture
is 60% sand, 40% 3/4 inch
crushed gravel.

If you use sand/gravel,
the mix is one part
cement to 4 parts sand,
and gravel.

When you can bring up
a wave of cement
without it collapsing,
it is the right stiffness.


Forms filled with concrete


Shovel the mixed cement
from the wheelbarrow,
into he forms, a wide
flat shovel works best.

One sack of cement will
make ten concrete slabs.

It takes two wheel barrel
mixes to make ten slabs.

Troweled and edged


Finishing


After pouring the cement
into the forms, trowel it
level.

Wait about half an hour
for the cement to firm
up, time depends on
temperature.

Run a straw broom lightly
over the form to create
a texture.

Use a cement edger and
go around each individual
slab.

If it is sunny day, cover
with a tarp to prevent the
cement from drying to
quickly.
Drying to fast will cause
the cement to crack.

Sprinkle the concrete
lightly with water two or
three times a day.

Wait two days, then
remove the screws from
the divider slats.

Gently tip the form over
allowing the slabs to fall
away from the form onto
soft ground.

Take care in handling the
slabs at this stage, as
they will not be fully cured
for another 7 to 10 days.

Stack them upright so
the air can ventilate
around them.
Sprinkle the slabs
with water, as needed.

Finished slabs left to cure
finished concrete slabs removed from forms
After each use, scrape away
all traces of cement that may
be sticking to the forms.

A garden hoe works well.
Scrape away what you
can, and finish up with
the garden hose.

Replace the dividers, in
their original position,
and secure with screws.

Re Oil the forms and
you are ready for the
next mix.


Finished concrete woodshed floor


This view shows concrete
slabs in place, forming the
floor for the wood shed.

The slabs were laid over
a layer of sand and weed
control fabric.


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